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Date: Wed, 18 May 2011 21:16:54 +0000 (UTC)
From: "Daryn Sharp (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HADOOP-6605) Add JAVA_HOME detection to
 hadoop-config
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    [ https://issues.apache.org/jira/browse/HADOOP-6605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13035679#comment-13035679 ] 

Daryn Sharp commented on HADOOP-6605:
-------------------------------------

bq. java_home is not a stable interface. It cannot be trusted to last, especially given the question marks that hang over Java on OS X.

This is not true. Apple engineers tell devs on their java-dev list to use java_home.  The following technote says to use java_home.  The utility was added in part so future non-system provided jvms don't monkey with system controlled directories.

http://developer.apple.com/library/mac/#qa/qa1170/_index.html

> Add JAVA_HOME detection to hadoop-config
> ----------------------------------------
>
>                 Key: HADOOP-6605
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6605
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Chad Metcalf
>            Assignee: Eli Collins
>            Priority: Minor
>             Fix For: 0.22.0
>
>         Attachments: HADOOP-6605.patch, hadoop-6605-1.patch
>
>
> The commands that source hadoop-config.sh currently bail with an error if JAVA_HOME is not set. Let's detect JAVA_HOME (from a list of locations on various OS types) if JAVA_HOME is not already set by hadoop-env.sh or the environment. This way users don't have to manually configure it.

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